JP2003029072A - Plane-of-polarization preservation type optical fiber - Google Patents

Plane-of-polarization preservation type optical fiber

Info

Publication number
JP2003029072A
JP2003029072A JP2001210648A JP2001210648A JP2003029072A JP 2003029072 A JP2003029072 A JP 2003029072A JP 2001210648 A JP2001210648 A JP 2001210648A JP 2001210648 A JP2001210648 A JP 2001210648A JP 2003029072 A JP2003029072 A JP 2003029072A
Authority
JP
Japan
Prior art keywords
optical fiber
polarization
maintaining optical
mode field
type optical
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2001210648A
Other languages
Japanese (ja)
Inventor
Naoki Shamoto
尚樹 社本
Fumihiko Nishimura
文比古 西村
Kuniharu Himeno
邦治 姫野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujikura Ltd
Original Assignee
Fujikura Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujikura Ltd filed Critical Fujikura Ltd
Priority to JP2001210648A priority Critical patent/JP2003029072A/en
Priority to US10/057,069 priority patent/US6597847B2/en
Priority to EP02290197A priority patent/EP1275990A3/en
Priority to CNB021062625A priority patent/CN1174269C/en
Publication of JP2003029072A publication Critical patent/JP2003029072A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
    • G02B6/105—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type having optical polarisation effects

Abstract

PROBLEM TO BE SOLVED: To provide a polarization holding type optical fiber whose connection loss is made smaller by making the non-circular amount of a mode filed diameter smaller. SOLUTION: The non-circular rate of the mode field diameter of the plane-of- polarization preservation type optical fiber in a use wavelength region is set to be <= about 3.2%. When the plane-of-polarization preservation type optical fibers whose non-circular rate of the mode field diameter is small are connected each other, the connection loss is restrained to be about 0.13 dB at the most.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【発明の属する技術分野】本発明は、光通信、光センサ
等に用いられる偏波面保存型光ファイバに関し、特に、
良好な接続特性を有する偏波面保存型光ファイバに関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polarization-maintaining optical fiber used for optical communication, optical sensors, etc.
The present invention relates to a polarization-maintaining optical fiber having good connection characteristics.

【０００２】[0002]

【従来の技術】近年、光通信分野や光センサの分野にお
いて、互いに独立な２つの偏波状態を保存したまま光を
伝搬する偏波面保存型光ファイバが広く用いられてい
る。この偏波面保存型光ファイバは、横方向と縦方向の
屈折率が異なるようにし、横方向と縦方向の伝搬定数の
差を大きくして、両偏波光間のモード結合を小さくした
ものである。この偏波面保存型光ファイバとしていくつ
かの種類のものが開発されているが、低損失で量産性に
優れた偏波面保存型光ファイバとしてＰＡＮＤＡ型光フ
ァイバがある。このＰＡＮＤＡ型光ファイバとは、応力
付与部の断面が円形であり、この応力付与部が酸化ホウ
素（Ｂ2Ｏ3）を添加したシリカガラスからなる偏波面保
持型光ファイバをいう。このＰＡＮＤＡ型光ファイバの
長手方向に対する断面を図２に示す。2. Description of the Related Art In recent years, a polarization-maintaining optical fiber that propagates light while preserving two polarization states independent of each other has been widely used in the fields of optical communication and optical sensors. In this polarization-maintaining optical fiber, the refractive indices in the horizontal and vertical directions are made different, the difference in the propagation constants in the horizontal and vertical directions is made large, and the mode coupling between both polarized lights is made small. . Although several types of polarization-maintaining optical fibers have been developed, there is a PANDA-type optical fiber as a polarization-maintaining optical fiber that has low loss and is excellent in mass productivity. The PANDA type optical fiber is a polarization-maintaining optical fiber in which the stress-applying part has a circular cross section and the stress-applying part is made of silica glass to which boron oxide (B 2 O 3 ) is added. FIG. 2 shows a cross section of the PANDA type optical fiber in the longitudinal direction.

【０００３】図２中、１０は偏波保持型光ファイバの一
例であるＰＡＮＤＡ型光ファイバである。１１はコア、
１２はクラッド、１３は応力付与部である。酸化ホウ素
を添加したシリカガラスからなる応力付与部１３の熱膨
張係数はシリカガラスの熱膨張係数の数倍あるため、線
引き時に収縮し、２つの応力付与部１３を結ぶ方向にコ
ア１１を引っ張る応力を残し、これに垂直な方向にコア
１１を圧縮する応力を残す。このような異なる応力が加
わると、２つの応力付与部１３を結ぶ方向とこれに垂直
な方向とで屈折率が変化する。この２つの方向で屈折率
が異なることにより、ＰＡＮＤＡ型光ファイバを伝搬す
る光の速度が相違する。このＰＡＮＤＡ型光ファイバ１
０を伝搬する光のうち、２つの応力付与部１３を結ぶ方
向は伝搬速度が遅く、スロー軸又はＸ軸と呼ばれる。一
方、このスロー軸に対して垂直な方向は伝搬速度が速
く、ファスト軸又はＹ軸と呼ばれる。In FIG. 2, reference numeral 10 denotes a PANDA type optical fiber which is an example of a polarization maintaining type optical fiber. 11 is the core,
Reference numeral 12 is a clad, and 13 is a stress applying portion. Since the thermal expansion coefficient of the stress-applying portion 13 made of silica glass to which boron oxide is added is several times the thermal expansion coefficient of silica glass, the stress that contracts during drawing and pulls the core 11 in the direction connecting the two stress-applying portions 13 Is left, and the stress that compresses the core 11 in the direction perpendicular to this is left. When such different stresses are applied, the refractive index changes between the direction connecting the two stress applying portions 13 and the direction perpendicular to this. Since the refractive indices are different in these two directions, the speed of light propagating through the PANDA type optical fiber is different. This PANDA type optical fiber 1
Of the light that propagates 0, the propagation speed is slow in the direction that connects the two stress applying portions 13, and is called the slow axis or X axis. On the other hand, the direction perpendicular to the slow axis has a high propagation velocity and is called the fast axis or Y axis.

【０００４】[0004]

【発明が解決しようとする課題】しかし、ＰＡＮＤＡ型
光ファイバ１０は、応力付与部１３の粘性がその周囲の
クラッド１２よりも小さいために、光ファイバの製造工
程において高温で紡糸する際に、コア１１の断面が理想
的な円形とならず、非円状態となりやすい。コア１１が
非円となると、光ファイバ同士を接続する際に、接続損
失が大きくなる。一方、偏波面保存型光ファイバのよう
なシングルモードファイバにおいては、コア近傍のクラ
ッド部分にも光パワーが広がって伝搬する。クラッド方
向への広がりは指数関数的に小さくなるが、シングルモ
ードファイバについては、コア径という屈折率分布に関
する物理的な境界を示す量よりも、光パワーが光ファイ
バ中をどの程度広がっているかを示す量であるモードフ
ィールド径が重要な意味を持つ。従って、モードフィー
ルド径の非円の程度によって、偏波保持型光ファイバの
接続特性が大きな影響を受けると考えられる。そのた
め、モードフィールド径の非円量がどの程度であれば、
良好な接続特性を持つ偏波保持型光ファイバを実現する
ことができるかを明らかにすることが必要となる。本発
明は、このような事情を考慮してなされたもので、モー
ドフィールド径の非円量を小さくして、接続損失の小さ
い偏波保持型光ファイバを提供することを目的とする。However, in the PANDA type optical fiber 10, the viscosity of the stress applying portion 13 is smaller than that of the cladding 12 around the stress applying portion 13. Therefore, when spinning at high temperature in the optical fiber manufacturing process, the core The cross section of 11 is not ideally circular, and tends to be in a non-circular state. When the core 11 is non-circular, the connection loss becomes large when connecting the optical fibers. On the other hand, in a single mode fiber such as a polarization-maintaining optical fiber, the optical power spreads and propagates also in the clad portion near the core. The spread in the clad direction is exponentially small, but for single-mode fibers, the extent to which the optical power spreads in the optical fiber is larger than the amount that indicates the physical boundary of the refractive index distribution called the core diameter. The mode field diameter, which is the indicated quantity, has an important meaning. Therefore, it is considered that the non-circularity of the mode field diameter greatly affects the connection characteristics of the polarization maintaining optical fiber. Therefore, if the non-circular amount of the mode field diameter is
It is necessary to clarify whether a polarization-maintaining optical fiber with good connection characteristics can be realized. The present invention has been made in view of such circumstances, and an object thereof is to provide a polarization maintaining optical fiber with a small non-circular amount of the mode field diameter and a small connection loss.

【０００５】[0005]

【課題を解決するための手段】以上の課題を解決するた
めに、請求項１記載の発明は、光の偏波面を保存しつつ
光を伝搬する偏波面保存型光ファイバにおいて、使用波
長帯域でのモードフィールド径の最大値と最小値とから
求められるモードフィールド非円率を３．２％以下とし
て、接続損失を小さくしたことを特徴とする偏波面保存
型光ファイバである。請求項２記載の発明は、請求項１
記載の偏波面保存型光ファイバにおいて、偏波面保存型
光ファイバのコア非円率を２０％以下としたことを特徴
とする。請求項３記載の発明は、請求項１又は２記載の
偏波面保存型光ファイバにおいて、 偏波面保存型光フ
ァイバがＰＡＮＤＡ型光ファイバであることを特徴とす
る。In order to solve the above-mentioned problems, the invention according to claim 1 is a polarization-maintaining optical fiber that propagates light while preserving the polarization plane of the light, in the wavelength band used. The polarization-preserving optical fiber is characterized in that the splice loss is reduced by setting the mode field non-circularity calculated from the maximum value and the minimum value of the mode field diameter of 3.2% or less. The invention described in claim 2 is claim 1
The polarization-maintaining optical fiber described above is characterized in that the core non-circularity of the polarization-maintaining optical fiber is 20% or less. The invention described in claim 3 is the polarization-maintaining optical fiber according to claim 1 or 2, wherein the polarization-maintaining optical fiber is a PANDA type optical fiber.

【０００６】[0006]

【発明の実施の形態】以下、本発明を詳細に説明する。
図１に、偏波面保存型光ファイバの接続損失に影響を与
える量であるモードフィールド径の測定装置の一例を示
している。図１中、符号１はレーザ光源、符号２は被測
定光ファイバである偏波面保存型光ファイバ、例えばＰ
ＡＮＤＡ型光ファイバである。符号３はレンズ系からな
る光ビーム拡大装置である。レーザ光源１から発せられ
たＬＰ01モードは偏波面保存型光ファイバ２の一端に入
射されて伝搬し、偏波面保存型光ファイバ２の他端から
出射されて光ビーム拡大装置３に入射する。光ビーム拡
大装置３では、偏波面保存型光ファイバ２出射端での光
ビームが拡大され、この拡大された光ビームは赤外線カ
メラで受光されて、その２次元の光強度分布が像４とし
て出力される。BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below.
FIG. 1 shows an example of a device for measuring a mode field diameter, which is an amount that affects the connection loss of a polarization-maintaining optical fiber. In FIG. 1, reference numeral 1 is a laser light source, reference numeral 2 is a polarization-maintaining optical fiber which is an optical fiber to be measured, for example, P
It is an ANDA type optical fiber. Reference numeral 3 is a light beam expanding device including a lens system. The LP 01 mode emitted from the laser light source 1 is incident on one end of the polarization-maintaining optical fiber 2 and propagates, is emitted from the other end of the polarization-maintaining optical fiber 2, and is incident on the optical beam expanding device 3. In the light beam expansion device 3, the light beam at the exit end of the polarization-maintaining optical fiber 2 is expanded, the expanded light beam is received by the infrared camera, and its two-dimensional light intensity distribution is output as an image 4. To be done.

【０００７】偏波面保存型光ファイバ２が理想的な軸対
称の形状であれば、像４として出力される光強度分布は
同心円状となり、像４中の半径ｒは、すべて同一の値と
なるが、実際に製造された偏波面保存型光ファイバ２は
軸対称とはならず、偏波面保存型光ファイバ２の導波部
の断面は非円状態であるため、像４中の半径ｒはばらつ
きを生じる。この半径ｒの最大値と最小値とを用いて、
（１）式に基づいてモードフィールド径２ｗを求めた。If the polarization-maintaining optical fiber 2 has an ideal axisymmetric shape, the light intensity distribution output as the image 4 is concentric, and the radii r in the image 4 are all the same value. However, the polarization-maintaining optical fiber 2 actually manufactured does not have axial symmetry, and the cross section of the waveguide portion of the polarization-maintaining optical fiber 2 is in a non-circular state, so the radius r in the image 4 is Variation occurs. Using the maximum value and the minimum value of this radius r,
The mode field diameter 2w was calculated based on the equation (1).

【数１】 （１）式において、ｆ（ｒ）は電界分布を表し、電界の
２乗ｆ2が光パワーに比例する。（１）式より定められ
るモードフィールド径の最大値と最小値とから、モード
フィールド径の非円の程度を示す量であるモードフィー
ルド径非円率を（２）式に基づいて求める。[Equation 1] In the equation (1), f (r) represents the electric field distribution, and the square of the electric field f 2 is proportional to the optical power. From the maximum value and the minimum value of the mode field diameter determined by the equation (1), the mode field diameter non-circularity, which is an amount indicating the degree of non-circle of the mode field diameter, is obtained based on the equation (2).

【数２】 （２）式において、ＭＦＤはモードフィールド径のこと
であり、Ｍａはモードフィールド径の最大値、Ｍｂはモ
ードフィールド径の最小値である。[Equation 2] In the equation (2), MFD is the mode field diameter, Ma is the maximum value of the mode field diameter, and Mb is the minimum value of the mode field diameter.

【０００８】表１に、コア非円率が約１５％を超えて比
較的コア非円の程度の大きい偏波面保存型光ファイバに
ついて、そのモードフィールド径非円率、コア非円率、
コア偏心量を示している。このようなコアの非円は、紡
糸工程において、応力付与部の粘性がクラッドより小さ
いことが原因となって生じていると考えられる。Table 1 shows a mode field diameter non-circularity, a core non-circularity of a polarization-maintaining optical fiber having a core non-circularity exceeding about 15% and a relatively large core non-circularity.
The amount of core eccentricity is shown. It is considered that such a non-circle of the core is caused by the viscosity of the stress applying portion being smaller than that of the clad in the spinning process.

【表１】 ここで、コア非円率とは、コアの外接円と内接円の直径
の差をコア径で割った量で定義している。また、コア偏
心量とは、コアの中心とクラッド中心との間の距離を意
味する。なお、ここでのモードフィールド径非円率は、
波長1550ｎｍの光を入射して測定したときのモードフィ
ールド径を基に計算した値である。表１に示した偏波面
保存型光ファイバのサンプルを２本ずつ接続したときの
接続損失を表２に示す。[Table 1] Here, the core non-circularity is defined as an amount obtained by dividing the difference in diameter between the circumscribed circle and the inscribed circle of the core by the core diameter. The core eccentricity means the distance between the center of the core and the center of the cladding. The mode field diameter non-circularity here is
It is a value calculated based on the mode field diameter when light with a wavelength of 1550 nm is incident and measured. Table 2 shows the connection loss when two samples of the polarization-maintaining optical fiber shown in Table 1 are connected.

【表２】 測定に用いた光の波長は1550ｎｍであり、測定は、接続
される一方の光ファイバを接続ごとに接続面を９０°ま
で回転させて行った。[Table 2] The wavelength of the light used for the measurement was 1550 nm, and the measurement was performed by rotating the connecting surface of one optical fiber to be connected up to 90 ° for each connection.

【０００９】表２において、接続損失の値に幅があるの
は、接続面を回転させながら行っているためであり、モ
ードフィールド径の非円の方向が一致している場合に損
失が小さく、モードフィールド径の非円の方向がずれる
ほど損失が大きくなる。表２からわかるように、組み合
わせ番号１〜１２の偏波面保存型光ファイバ同士の接続
においては、接続される偏波面保存型光ファイバのコア
非円率が約２０％程度であっても、モードフィールド径
非円率が約３．２％以下であれば、接続時の接続損失は
最大で0.13ｄＢであり、通常の光ファイバの接続損失の
許容限度を0.2ｄＢ〜0.3ｄＢであると考えると、良好な
接続損失となっている。一方、組み合わせ番号１３〜１
６の偏波面保存型光ファイバ同士の接続においては、接
続される偏波面保存型光ファイバのコア非円率が２５％
を超え、モードフィールド径非円率が約４．５％を超え
ており、このときの接続損失は最大で0.5ｄＢ以上とな
って、上記接続損失の許容限度である0.2ｄＢ〜0.3ｄＢ
を超えており、使用上好ましくない。In Table 2, the value of the connection loss has a range because it is performed while rotating the connection surface, and the loss is small when the non-circular directions of the mode field diameters coincide with each other. The loss increases as the non-circular direction of the mode field diameter shifts. As can be seen from Table 2, in the connection of the polarization-maintaining optical fibers of combination numbers 1 to 12, even if the core non-circularity of the connected polarization-maintaining optical fibers is about 20%, If the field diameter non-circularity is about 3.2% or less, the maximum splice loss at the time of splicing is 0.13 dB, and the allowable limit of splice loss of an ordinary optical fiber is 0.2 dB to 0.3 dB. , Has a good connection loss. On the other hand, combination numbers 13 to 1
In the connection of the polarization maintaining optical fibers of No. 6, the core non-circularity of the connected polarization maintaining optical fibers is 25%.
And the non-circularity of the mode field exceeds about 4.5%, and the maximum connection loss at this time is 0.5 dB or more, which is the allowable limit of the above connection loss of 0.2 dB to 0.3 dB.
Is exceeded, which is not preferable for use.

【００１０】以上の結果から、モードフィールド径非円
率が約３．２％以下となるようにすれば、接続損失の小
さい偏波面保存型光ファイバを実現することができる。
このような偏波面保存型光ファイバを製造するために
は、予めコアの非円率が小さい母材を用いて、紡糸工程
において紡糸の張力を調整して紡糸する。また、以上の
結果から、偏波面保存型光ファイバのコア非円率は２０
％以下であることが好ましい。以上の説明においては、
モードフィールド径の測定を波長1550ｎｍの光に対して
行った場合について説明しているが、光の波長はこれに
限定されるものではなく、モードフィールド径は、使用
される波長での光パワーが光ファイバ中をどの程度広が
っているかを示す量であることから、使用波長帯域での
モードフィールド径非円率が３．５％以下であれば、本
発明の目的を達成することができる。From the above results, if the mode field diameter non-circularity is set to about 3.2% or less, it is possible to realize a polarization-maintaining optical fiber with a small splice loss.
In order to manufacture such a polarization-maintaining optical fiber, a preform having a small non-circularity of the core is used in advance, and the spinning tension is adjusted in the spinning step to perform spinning. From the above results, the core non-circularity of the polarization-maintaining optical fiber is 20.
% Or less is preferable. In the above explanation,
Although the case where the mode field diameter is measured for light with a wavelength of 1550 nm has been described, the wavelength of light is not limited to this, and the mode field diameter depends on the optical power at the wavelength used. Since the amount indicates how much the fiber is spread in the optical fiber, the object of the present invention can be achieved if the mode field diameter non-circularity in the used wavelength band is 3.5% or less.

【００１１】また、以上の説明においては、ＰＡＮＤＡ
型光ファイバを例として説明したが、コアの周囲に応力
付与部を配置してなる他の種類の偏波面保存型光ファイ
バについても同様であり、ＰＡＮＤＡ型ファイバに限定
されるものではない。この例においては、使用波長帯域
での偏波面保存型光ファイバのモードフィールド径非円
率を約３．２％以下とすることにより、接続損失の小さ
い偏波面保存型光ファイバを実現することができる。Further, in the above description, PANDA
Although the description has been made by taking the type optical fiber as an example, the same applies to other types of polarization-maintaining optical fibers in which a stress applying portion is arranged around the core, and the present invention is not limited to the PANDA type fiber. In this example, by setting the mode field diameter non-circularity of the polarization-maintaining optical fiber in the used wavelength band to about 3.2% or less, a polarization-maintaining optical fiber with a small splice loss can be realized. it can.

【００１２】[0012]

【発明の効果】以上説明したように、本発明によれば、
使用波長帯域での偏波面保存型光ファイバのモードフィ
ールド径非円率を約３．２％以下とすることにより、接
続損失の小さい偏波面保存型光ファイバを実現すること
ができる。As described above, according to the present invention,
By setting the mode field diameter non-circularity of the polarization-maintaining optical fiber in the used wavelength band to about 3.2% or less, a polarization-maintaining optical fiber with a small connection loss can be realized.

【図面の簡単な説明】[Brief description of drawings]

【図１】偏波面保存型光ファイバのモードフィールド径
の測定方法の一例を示す図である。FIG. 1 is a diagram showing an example of a method of measuring a mode field diameter of a polarization-maintaining optical fiber.

【図２】ＰＡＮＤＡ型光ファイバの長手方向に対する断
面を示す図である。FIG. 2 is a view showing a cross section in the longitudinal direction of a PANDA type optical fiber.

【符号の説明】 １…レーザ光源、２…偏波面保存型光ファイバ、３…光
ビーム拡大装置、４…像１０…ＰＡＮＤＡ型ファイバ、
１１…コア、１２…クラッド、１３…応力付与部[Explanation of Codes] 1 ... Laser light source, 2 ... Polarization preserving type optical fiber, 3 ... Optical beam expanding device, 4 ... Image 10 ... PANDA type fiber,
11 ... Core, 12 ... Clad, 13 ... Stress applying part

───────────────────────────────────────────────────── フロントページの続き (72)発明者 姫野 邦治 千葉県佐倉市六崎1440番地 株式会社フジ クラ佐倉事業所内 Ｆターム(参考） 2H050 AB03Z AC44 AD06 AD16   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kuniharu Himeno             Fuji Co., Ltd. 1440 Rokuzaki, Sakura City, Chiba Prefecture             Kura Sakura Office F-term (reference) 2H050 AB03Z AC44 AD06 AD16

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】 光の偏波面を保存しつつ光を伝搬する偏
波面保存型光ファイバにおいて、 使用波長帯域でのモードフィールド径の最大値と最小値
とから求められるモードフィールド非円率を３．２％以
下として、接続損失を小さくしたことを特徴とする偏波
面保存型光ファイバ。1. In a polarization-maintaining optical fiber that propagates light while preserving the polarization plane of light, the mode field non-circularity obtained from the maximum value and the minimum value of the mode field diameter in a used wavelength band is 3 A polarization-maintaining optical fiber having a splice loss of less than 0.2%. 【請求項２】 前記偏波面保存型光ファイバのコア非円
率が２０％以下であることを特徴とする請求項１記載の
偏波面保存型光ファイバ。2. The polarization-maintaining optical fiber according to claim 1, wherein a core non-circularity of the polarization-maintaining optical fiber is 20% or less. 【請求項３】 前記偏波面保存型光ファイバはＰＡＮＤ
Ａ型光ファイバであることを特徴とする請求項１又は２
記載の偏波面保存型光ファイバ。3. The polarization maintaining optical fiber is a PAND.
The optical fiber is an A-type optical fiber.
The polarization-maintaining optical fiber described.
JP2001210648A 2001-07-11 2001-07-11 Plane-of-polarization preservation type optical fiber Pending JP2003029072A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2001210648A JP2003029072A (en) 2001-07-11 2001-07-11 Plane-of-polarization preservation type optical fiber
US10/057,069 US6597847B2 (en) 2001-07-11 2002-01-25 Optical fiber for preserving plane of polarization
EP02290197A EP1275990A3 (en) 2001-07-11 2002-01-29 Optical fiber for preserving plane of polarization
CNB021062625A CN1174269C (en) 2001-07-11 2002-02-24 Polarization plane stablized optical fibre

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001210648A JP2003029072A (en) 2001-07-11 2001-07-11 Plane-of-polarization preservation type optical fiber

Publications (1)

Publication Number Publication Date
JP2003029072A true JP2003029072A (en) 2003-01-29

Family

ID=19046084

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2001210648A Pending JP2003029072A (en) 2001-07-11 2001-07-11 Plane-of-polarization preservation type optical fiber

Country Status (4)

Country Link
US (1) US6597847B2 (en)
EP (1) EP1275990A3 (en)
JP (1) JP2003029072A (en)
CN (1) CN1174269C (en)

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Also Published As

Publication number Publication date
CN1174269C (en) 2004-11-03
US6597847B2 (en) 2003-07-22
US20030086669A1 (en) 2003-05-08
EP1275990A3 (en) 2005-03-02
EP1275990A2 (en) 2003-01-15
CN1396466A (en) 2003-02-12

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